Significantly changed intergranular corrosion and exfoliation corrosion behavior of the ultra-fine grained Al–5 mass% Cu alloy fabricated by ECAP
作者： D Song , AB Ma , JH Jiang , PH Lin , FM Lu
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摘要: Significantly changed intergranular corrosion (IGC) and exfoliation (EFC) behaviors of the equal-channel-angular-pressed (ECAPed) Al–Cu alloy were discovered through immersion test, electrochemical measurements, microstructure observation. The ECAPed alloys with ultra-fine grained (UFG) α(Al) matrix extremely refined θ-phase particles displayed obvious decreased IGC sensitivity, but deteriorated susceptibility to EFC. sensitivity presented propagation depths in test NaCl + H2O2 solutions increased polarization resistance impedance spectrum MIL-H-600 solution. reason for was breakage net structure θ phase during ECAP process, which destroys continuity channel. EFC EXCO solution gradual evolution from serious attack into lamellar EFC, finally complete dissolution surface grains. Meanwhile, sharply increasing passes. This phenomenon caused by aspects ratio deformed grains gradually alloys.
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